Ok wtf is this even. Lets put aside the absurdity of the situations and call out why this is total trash.
A series can get away with next to anything if it understands what it is and accepts what it is.
This series does not, in fact it actively rejects itself.
He is in a world that he can get stronger by having sex, actively is intrested in it. But a barrier prevents him outside of situations were a girl randomly falls on him. So he never is allowed actual sex. This is erotica, why, it adds nothing, he could still have those scenes without the cock blocking. the readers are horny and want him to get laid, its a power fantasy why make part of the power fantasy a the MC being being unable to have sex because he is in the age restricted version of the game? And when its one of the rare MC's who actually wants to go for it.
Ok so feels the need to belittle and stomp on the MC in a power fantasy. What about its other traits.
So the main girls have a trait of wearing clothing with cutouts which exposed boobs, that's nice. He points it out to the first girl and she realizes her boob was out and now wears her cloths normally... So he is seeking out the girls who expose themselves and getting them dressed.
This series looks like a author mocking their readers, they maybe even hates their own readers. Like really what is the point of making a series like this if your just going to deny and remove the entire premise? Why make a power fantasy eratica harem, if the MC just force loses even when he wins. He never loses a fight, or loses the girls, but he is still blocked by the game system.
If your going to do that go all in and just make him a NTR'ed cuck. This manga needs to decide, who is its audience, what is its premise. And then actually roll with it. As is its just baiting readers looking for the erotic harem, and the exposer, then denying them to troll. As it fails to even decided that its the worst kind of trash.